Why wont my project download?

Hello everyone, I have a 5/03 processor and I can't get program to download. I have verified my program and it shows no errors. I can upload and the processor communicates just fine. Trying to download it says processor is not communicating. Thank you

open the offline file ... go to Controller Properties at the top of the project tree ... go to the Controller Communications tab ... set the entries on the top line (Driver, Route, and Processor Node) to the same settings that you used the last time you successfully communicated ... then try the Download operation again ...

That did it. Thank you